基于全生命周期评估与多目标优化的再生混凝土应用研究

Application Research of Recycled Aggregate Concrete Based on Life Cycle Assessment and Multi-objective Optimization

为探究再生混凝土在经济和环境上的最佳方案以便为工程决策提供参考,基于全生命周期评估法构建了再生混凝土碳排放量和成本计算模型,并采用TOPSIS法对其环境和经济指标进行多目标优化,进而选出满足经济和环境目标的适配性方案。研究结果显示,在整个生命周期中,随再生骨料替代率增加再生混凝土的碳排放量与成本均显现降低态势;水灰比为0.47再生骨料替代率为100%的混凝土为最佳方案;若将其性能考虑在内,则水灰比为0.39再生骨料替代率为50%的混凝土为最佳方案。

To provide reference for engineering decision-making,this research explores the optimal scheme of recycled aggregate concrete in the economy and environment.Based on the life cycle assessment method,the calculation model of carbon emissions and costs of recycled aggregate concrete is built.TOPSIS technique is used to optimize the environmental and economic indicators and then select the adaptive scheme to meet the economic and environmental goals.The results show that the carbon emission and cost of recycled aggregate concrete decrease with the increase of recycled aggregate concrete replacement rate throughout the life cycle.Concrete with a water-to-cement ratio of 0.47 and a recycled aggregate replacement rate of 100%is the best scheme If its performance is taken into account,the concrete with a water-to-cement ratio of 0.39 and a recycled aggregate replacement rate of 50%is the best scheme.